<template>
  <div>
    <h3>这个是Father组件{{ num }}</h3>
    <!-- <Son v-model="num" /> -->
    <Son :a.sync="num" />
  </div>
</template>

<script>
import Son from './son.vue'
export default {
  components: {
    Son
  },
  data() {
    return {
      num: 100
    }
  }
}
</script>

<style>
</style>
